I was reading the LDD driver discussion on RC and noticed that at some point in time they added a 10K ohm 1/2W resistor to pull the PWM signal to 0 when there was no power to the driver or during a reboot of the controller.

Is this something that is possible to keep the Jebao pumps from running at full power when the Reef Angel reboots?

I'll read it through when I find some time, but if I understood what you said, they built custom boards, right?They are not using the RA dimming channels, correct?Any expansion module you use will not give you this behavior. So, his 16ch module will not have this behavior you mentioned.This only happens when the pumps are connected to the standard dimming channels.If you use the RA dimming expansion module, the pumps would stay at the last state before the controller rebooted.The reason being is that the standard dimming channels are directly using the controller's ports. The controller ports are defaulted to 100% or high level whenever the controller reboots.If you are using an expansion module, you would be connecting to a different chip and not to the controller directly, which would not cause the channels to go to 100% or high level.So, if you would like to avoid this behavior, the best option would be to use a dimming expansion module. I don't think a resistor will do it The Jebao cable already has one resistor tied to the ground, BTW.Another solution that I may be able to do is to have a custom bootloader, but that would require you to purchase a AVR programmer or send your head unit for bootloader upgrade.With this custom bootloader, I can change the status of the default high level to low when the controller boots, so it would go to 0% instead of 100%.

I have both of my Jebao pumps on the standard dimming channel so I can't say if it only happens on there or not, but I know I have seen several people mention it happens to them when they re-boot their controller.

I haven't put my light together yet, but I know that other have and they are saying that the light stay off on re-boot of their controllers.

This is just a suggestion and a thought that I had that may work, so if it does great, if not then we live with it the way it has been.